Enhancement: back button to main menu reload

lib/pages/detail.dart

@@ -3,6 +3,7 @@ import 'dart:math';
 
 import 'package:carousel_slider/carousel_slider.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_markdown/flutter_markdown.dart';
 import 'package:gymlink_module_web/components/app_bar.dart';
 import 'package:gymlink_module_web/components/heading.dart';
 import 'package:gymlink_module_web/interfaces/items.dart';
@@ -30,7 +31,7 @@ class _DetailPageState extends State<DetailPage> {
   bool isInCart = false;
   int quantity = 0;
   GymItem? item;
-  String categoryName = '';
+  String? categoryName;
   final CarouselController _carouselController = CarouselController();
   int _currentImage = 0;
 
@@ -68,12 +69,14 @@ class _DetailPageState extends State<DetailPage> {
       });
       if (mounted) {
         getCategories(context).then((value) {
-          categoryName = value
-              .firstWhere(
-                (element) => element.id == (item!.categoryId),
-                orElse: () => GymCategory(id: item!.categoryId, name: ''),
-              )
-              .name;
+          setState(() {
+            categoryName = value
+                .firstWhere(
+                  (element) => element.id == (item!.categoryId),
+                  orElse: () => GymCategory(id: item!.categoryId, name: ''),
+                )
+                .name;
+          });
         });
       }
     }
@@ -147,10 +150,12 @@ class _DetailPageState extends State<DetailPage> {
               IconButton(
                 icon: const Icon(Icons.add),
                 onPressed: () async {
-                  await addItemToCart(widget.id);
-                  setState(() {
-                    quantity++;
-                  });
+                  if (item!.count > quantity) {
+                    await addItemToCart(widget.id);
+                    setState(() {
+                      quantity++;
+                    });
+                  }
                 },
               ),
             ],
@@ -260,15 +265,21 @@ class _DetailPageState extends State<DetailPage> {
                                     }).toList(),
                                   ),
                                 ])
-                              : Image.network(item!.images[0].url,
-                                  width: min(
-                                      550, MediaQuery.sizeOf(context).width)),
+                              : Image.network(
+                                  item!.images[0].url,
+                                  height: 400,
+                                ),
                           Padding(
                               padding: const EdgeInsets.symmetric(vertical: 10),
                               child: Center(
-                                child: Text(
-                                    'Категория: ${categoryName == "" ? "Без категории" : categoryName}'),
+                                child: Text(categoryName != null
+                                    ? 'Категория: ${categoryName == "" ? "Без категории" : categoryName}'
+                                    : ''),
                               )),
+                          Center(
+                              child: MarkdownBody(
+                            data: '### Отстаток: _${item!.count}_',
+                          )),
                           item!.description != ''
                               ? Padding(
                                   padding: const EdgeInsetsDirectional.all(30),